Commit d4acd722 authored by James Bottomley's avatar James Bottomley
Browse files

[SCSI] sysfs: add filter function to groups



This patch allows the various users of attribute_groups to selectively
allow the appearance of group attributes.  The primary consumer of
this will be the transport classes in which we currently have
elaborate attribute selection algorithms to do this same thing.
Acked-by: default avatarGreg KH <greg@kroah.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent d52b3815
......@@ -16,25 +16,31 @@
#include "sysfs.h"
static void remove_files(struct sysfs_dirent *dir_sd,
static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
const struct attribute_group *grp)
{
struct attribute *const* attr;
int i;
for (attr = grp->attrs; *attr; attr++)
sysfs_hash_and_remove(dir_sd, (*attr)->name);
for (i = 0, attr = grp->attrs; *attr; i++, attr++)
if (!grp->is_visible ||
grp->is_visible(kobj, *attr, i))
sysfs_hash_and_remove(dir_sd, (*attr)->name);
}
static int create_files(struct sysfs_dirent *dir_sd,
static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
const struct attribute_group *grp)
{
struct attribute *const* attr;
int error = 0;
int error = 0, i;
for (attr = grp->attrs; *attr && !error; attr++)
error = sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
if (!grp->is_visible ||
grp->is_visible(kobj, *attr, i))
error |=
sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
if (error)
remove_files(dir_sd, grp);
remove_files(dir_sd, kobj, grp);
return error;
}
......@@ -54,7 +60,7 @@ int sysfs_create_group(struct kobject * kobj,
} else
sd = kobj->sd;
sysfs_get(sd);
error = create_files(sd, grp);
error = create_files(sd, kobj, grp);
if (error) {
if (grp->name)
sysfs_remove_subdir(sd);
......@@ -75,7 +81,7 @@ void sysfs_remove_group(struct kobject * kobj,
} else
sd = sysfs_get(dir_sd);
remove_files(sd, grp);
remove_files(sd, kobj, grp);
if (grp->name)
sysfs_remove_subdir(sd);
......
......@@ -32,6 +32,8 @@ struct attribute {
struct attribute_group {
const char *name;
int (*is_visible)(struct kobject *,
struct attribute *, int);
struct attribute **attrs;
};
......
......@@ -472,7 +472,7 @@ param_sysfs_setup(struct module_kobject *mk,
sizeof(mp->grp.attrs[0]));
size[1] = (valid_attrs + 1) * sizeof(mp->grp.attrs[0]);
mp = kmalloc(size[0] + size[1], GFP_KERNEL);
mp = kzalloc(size[0] + size[1], GFP_KERNEL);
if (!mp)
return ERR_PTR(-ENOMEM);
......
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